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UNITED STATES .ATENT OFFICE.

JONAS P. L. NELSON, OF PHILADELPHIA, PENNSYLVANIA.

DESK.

SPECIFICATION forming part of Letters Patent N 0. 589,018, dated August31, 1897.

Application filediSeptember 2Q, 1896. Serial No. 6Q'7,292. (No model.)

To aZZ whom it may concern:

Be it known that I, JONAS P. L. NELSON, a subject of the King of Swedenand Norway, residing in Philadelphia, in the county of Philadelphia, inthe State of Pennsylvania, have invented a certain new andusefulImprove,

ment in Desks, ofwhich the followingis a true and exact description,reference being had to the accompanying drawings, which form a part ofthe specification.

My invention relates to the construction of desks having hinged lids andextensible lidsupports, and has for its object to provide a newmechanism whereby the lid-supports are automatically extended andretracted by the opening and closing of the lid, the mechanism foraccomplishing this result being of a simple and at the same timepowerful character. Y N

The nature of my improvements will be best understood as described inconnection with the drawings, in which they are illustrated, and inwhich- Figure 1 is a perspective view of a desk provided with myimprovement, the lid being shown open and the lid-rests extending out.-ward. Fig. 2 is a perspective view of a portion of the desk andlid-rest-actuating mechanism, the position occupied being thatcorresponding to a closed lid. Fig. 3 is a side elevation taken on thesection-line 3 3 of Fig. 2, and Fig. 4 is a perspective view showing aslight modification of, the invention.

A indicates the desk, A being the writing-- table of the desk, so tospeak. B is the hinged lid, G and 0 indicating the wings of the hinges,by which the lid is secured to the front edge of the table.

K K indicate the lid-rests, which are of usual character, beingretractable into spaces left in the'desk'for that purpose and extensibleto form supports for the lid.

' F and F indicate two arms of a leverpivoted to the desk at F. H and Hindicate the arms of another lever also pivoted to the desk at H Theadjacent ends of these levers which are farthest removed from thelidrests are united by a rod G, and the short arm F of the lever F F ispivotally connected with a rod E, which in turn is pivotally connectedwith the lid at some distance above the pivot of the lid-hinge. In mypreferred construction I connect the rod E with the hinge, as

the lid 13, as shown in Fig. 4. The long arm of the lever H H isconnected by a rod I with the lid-rest K.

It will readily be seen thateach movement of the lid upon its hinges isthrough the lever system described transmitted directly to the rest K,causing the extension of the rest when the lid is opened and itsretraction when the lid is closed, and it will also be noticed that themechanism for accomplishing this result is exceedingly simple while atthe same time powerful and efficient.

Preferably the end of rod E, which is connected with the lever F F, iscurved downward, as shown'at E, so that when the lid is fully opened therod E will lie entirely beneath its top surface. Preferably, also, Iform the hinges with slots C and C in its two wings and connect the rodE with a pivotpin D to the wing C of the hinge, the rod lying, as shownin Figs. 1, 2, and 3, in the slots of the hinge.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a desk having a hinged lid and extensible lid-rests as specified,the combination with levers F F and H H pivoted to the desk, a rod Gconnecting adjacent ends of said 1evers, a rod E pivotally connected tothe lid and tolever F F and a rod I pivotally connected to lever H H andto an extensible lidrest all substantially as specified and so that thelid-rest will be drawn out by the opening of the lid and retracted bythe closing thereof.

2. In a desk having a lid and extensible lid-rests, the combination oflid-hinges G 0 having slots (3? C with levers F F and H H pivoted to thedesk and connected by rod G, a rod E pivoted to the wing O ofthe hingeand to lever F F said rod lying and moving JONAS P. L. NELSON.

Witnesses:

ROBERT W. LLOYD, D. STEWART.

